I'm (kinda) new to electronics and I have a simple question... So, I have a phone charger and I cut the wire because I wanted to connect the PWR and the GRD to another circuit. But when I connected the multimeter to the wires I get no readings. I believe this has to do with the wire (it has multiple copper wires...)

This kind of wire

I'm used to work with simple wires on arduino (not the copper ones) and this may be a dumb question but i'm really lost here :(

  • \$\begingroup\$ Are you sure your measuring the right two wires? \$\endgroup\$ – Passerby Sep 11 '15 at 4:56
  • \$\begingroup\$ Attach pictures, schematics or specifics (such as model number, voltage rating, etc) about the charger to allow people to help you better. \$\endgroup\$ – user7994 Sep 11 '15 at 5:35
  • \$\begingroup\$ I can almost guarantee you it has nothing to do with the fact that the wires are stranded. \$\endgroup\$ – Adam Haun Sep 11 '15 at 5:58
  • \$\begingroup\$ is your multitester sets to DC reading....its also posible that youve may not notice that it set on AC reading so the result is no reading in DC \$\endgroup\$ – user86272 Sep 11 '15 at 7:17

Most likely the charger is a switch mode power supply (SMPS) and needs a load to operate. When you measure across the supply with a multimeter the instrument's impedance is to large to make the supply start. Try connecting a resistor to draw a few milliamps and measure the voltage across it.


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